106 lines
3.9 KiB
GLSL
106 lines
3.9 KiB
GLSL
Shader "Custom/SphereGradientShader"
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{
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Properties
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{
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[HDR] _BaseColor("Base Color", Color) = (1,1,1,1)
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[HDR] _HeadColor("Head Color (Facing End)", Color) = (1,1,1,1)
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[HDR] _TailColor("Tail Color (Facing Start)", Color) = (1,1,1,1)
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[Toggle(_EMISSION_ON)] _UseEmission("Enable Emission", Float) = 0
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[HDR] _EmissionColor("Emission Color", Color) = (0,0,0,0)
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_EmissionIntensity("Emission Intensity", Range(0, 10)) = 1.0
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_MoveDir("Movement Direction", Vector) = (0,0,1,0)
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_GradientScale("Gradient Scale", Range(0, 2)) = 1.0
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_GradientPower("Gradient Power", Range(0.5, 5)) = 2.0
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[Enum(UnityEngine.Rendering.BlendMode)] _SrcBlend("Src Blend", Float) = 1
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[Enum(UnityEngine.Rendering.BlendMode)] _DstBlend("Dst Blend", Float) = 0
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[Enum(Off, 0, On, 1)] _ZWrite("ZWrite", Float) = 1
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}
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SubShader
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{
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Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalPipeline" "Queue" = "Geometry" }
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LOD 100
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Pass
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{
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Blend [_SrcBlend] [_DstBlend]
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ZWrite [_ZWrite]
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HLSLPROGRAM
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#pragma shader_feature _EMISSION_ON
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#pragma vertex vert
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#pragma fragment frag
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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struct Attributes
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{
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float4 positionOS : POSITION;
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float2 uv : TEXCOORD0;
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float3 normalOS : NORMAL;
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};
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struct Varyings
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{
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float4 positionCS : SV_POSITION;
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float2 uv : TEXCOORD0;
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float3 normalWS : TEXCOORD1;
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float3 positionWS : TEXCOORD2;
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};
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CBUFFER_START(UnityPerMaterial)
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float4 _BaseColor;
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float4 _HeadColor;
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float4 _TailColor;
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float4 _EmissionColor;
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float _EmissionIntensity;
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float4 _MoveDir;
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float _GradientScale;
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float _GradientPower;
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CBUFFER_END
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Varyings vert(Attributes input)
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{
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Varyings output;
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output.positionWS = TransformObjectToWorld(input.positionOS.xyz);
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output.positionCS = TransformWorldToHClip(output.positionWS);
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output.uv = input.uv;
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output.normalWS = TransformObjectToWorldNormal(input.normalOS);
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return output;
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}
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half4 frag(Varyings input) : SV_Target
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{
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float3 normal = normalize(input.normalWS);
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float3 moveDir = normalize(_MoveDir.xyz);
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// 计算空间渐变：-1 到 1 映射到 0 到 1
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// 面向 endPoint (moveDir) 时 dot 接近 1，使用 HeadColor
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// 面向 startPoint (-moveDir) 时 dot 接近 -1，使用 TailColor
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// 反转：使用 -dot 或者 1.0 - spatialLerp
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float spatialLerp = dot(normal, -moveDir) * 0.5 + 0.5;
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// 应用幂函数调整渐变分布
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spatialLerp = clamp(spatialLerp, 0.0, 1.0);
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half4 color = lerp(_TailColor, _HeadColor, spatialLerp);
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// 叠加一个基础的菲涅尔效果增加立体感
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float3 viewDir = normalize(GetWorldSpaceViewDir(input.positionWS));
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float fresnel = 1.0 - saturate(dot(normal, viewDir));
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fresnel = pow(fresnel, _GradientPower) * _GradientScale;
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color.rgb += fresnel * color.rgb * 0.5; // 边缘轻微提亮
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// 自发光叠加
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#if defined(_EMISSION_ON)
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color.rgb += _EmissionColor.rgb * _EmissionIntensity;
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#endif
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return color;
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}
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ENDHLSL
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}
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}
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}
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